From: Amit Shah Date: Mon, 11 Aug 2014 18:35:41 +0000 (+0530) Subject: virtio: rng: add derating factor for use by hwrng core X-Git-Tag: v4.14-rc1~6990^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=34679ec7a0c45da8161507e1f2e1f72749dfd85c;p=platform%2Fkernel%2Flinux-rpi.git virtio: rng: add derating factor for use by hwrng core The khwrngd thread is started when a hwrng device of sufficient quality is registered. The virtio-rng device is backed by the hypervisor, and we trust the hypervisor to provide real entropy. A malicious or badly-implemented hypervisor is a scenario that's irrelevant -- such a setup is bound to cause all sorts of badness, and a compromised hwrng is the least of the user's worries. Given this, we might as well assume that the quality of randomness we receive is perfectly trustworthy. Hence, we use 100% for the factor, indicating maximum confidence in the source. Signed-off-by: Amit Shah Reviewed-by: H. Peter Anvin Reviewed-by: Amos Kong Signed-off-by: Rusty Russell --- diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c index 0027137..2e3139e 100644 --- a/drivers/char/hw_random/virtio-rng.c +++ b/drivers/char/hw_random/virtio-rng.c @@ -116,6 +116,7 @@ static int probe_common(struct virtio_device *vdev) .cleanup = virtio_cleanup, .priv = (unsigned long)vi, .name = vi->name, + .quality = 1000, }; vdev->priv = vi;